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Functional decomposition

Theory

Calculator with four methods

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In a template below you have a simple calculator that subtracts, sums, divides, and multiplies the two numbers inside the switch statement. Now, we've decided to upgrade it to perform more complex tasks, such as logarithmic functions. For that, separate methods are a better solution. Let's start with decomposing what we have.

Take a look at the template and decompose operations of the calculator into four methods: subtractTwoNumbers(long a, long b) for subtraction, sumTwoNumbers(long a, long b) for adding, divideTwoNumbers(long a, long b) for integer division and multiplyTwoNumbers(long a, long b) for multiplication. Each method should print the result of calculations.

Note that you can't divide by zero. In case your second argument is zero, you should print the "Division by 0!" message.

Sample Input 1: 

1 + 2

Sample Output 1: 

3

Sample Input 2: 

4 / 0

Sample Output 2: 

Division by 0!
Write a program in Java 17
class SimpleCalculator {

// Implement your methods here
public static void subtractTwoNumbers...


public static void sumTwoNumbers...


public static void divideTwoNumbers...


public static void multiplyTwoNumbers...

// Implemented method
public static void power(long n, long p) {
long number = n;
long power = p;
long result = 1;
while (power > 0) {
if (power % 2 != 0) {
result *= number;
}
power /= 2;
number *= number;
}
System.out.println(result);
}
}

public class Main {

public static void main(String[] args) {

java.util.Scanner scanner = new java.util.Scanner(System.in);
long num1 = scanner.nextLong();
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